obama got a four-point bounce to put him in the lead. the president's favorable rating meantime remains above the crucial 50% mark at 52%. mr. romney is close but still in negative territory at 49%. he enjoys an edge on handling the deficit and joblessness, but trails on virtually every other big issue, including medicare, taxes and foreign policy. keeping them honest, when it comes to some of those issues, both candidates have come up short either on specifics or credibility. issues like cutting taxes without ballooning the deficit or burdening the middle class. the romney campaign has been asked again and again for specifics. here's runningmate paul ryan just yesterday on fox news. >> there's been a traditional democrat and republican consensus lowering tax rates by broadening the tax base works. and you can -- >> i have to -- you haven't given me the math. >> well, i don't have -- it would take me too long to go through all of the math. >> chris wallace kept trying but came away empty-handed. he's not the only one. take a look. >> whi